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1. Paterno 2 7 11
2. Pattern 2.7.1 Software
3. Pattern 2.7.1 Tool

Oct 21, 2011  Bit Patterns. About PRBS and ABS Bit Pattern Lengths. Import a Bit Pattern. Design a Custom Bit Pattern. Other Eye Diagram topics. Bit Patterns. PLTS allows you to specify a synthesized bit pattern (sequence) of between 8 and 32 bits that is convolved with the calculated time domain data to generate the eye diagram. The patterns are the result of three years of planning and discussion by the NCBCA and were developed through the efforts and technical expertise of Kegel's John Janawicz and Vincennes Head Coach Gary Sparks. On October 1, 2017, the NCBCA released two additional sport compliant patterns: 1 medium and 1 short, bringing the total number to 16. Figure 6.2.7.1 Black to move The Knight As a Substitute in Greco's Pattern. The previous section showed how the mating idea we associate with Morphy or Pillsbury—the use of a bishop on the long dark diagonal, plus another piece to seal off g8—can be achieved using a knight as the second piece rather than a rook or queen.

This is a set of macros and a dialog which allows the appearance of Hatch patterns within cells.

Project Description

This is a set of macros and a dialog which allows the appearance of Hatch patterns within cells.
Release Details
LibreOffice has 10 predefined hatch patterns which can be applied to graphic objects. This extension creates an image the same shape and dimension as the chosen cell. Using the coordinates of the cell corner, the pattern is placed on the Draw Page so the cell appears to contain a hatch pattern.

Patterns can be applied, deleted or changed by selecting the cells to be affected, starting the dialog and choosing the options.

New patterns may also be utilized.

Category/Categories

Calc Extension,

Current Release

Hatch Patterns for Cells - 1.2.1

Released Mar 08, 2018 — tested with:

LibreOffice 4.4, LibreOffice 5.0, LibreOffice 5.1, LibreOffice 5.2, LibreOffice 5.3, LibreOffice 5.4, LibreOffice 6.0,

There are no functional changes in this version.Off-line help is now included if you have the LibreOffice off-line help installed. Itwill be located on the Contents tab.
More about this release…

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A pseudorandom binary sequence (PRBS) is a binary sequence that, while generated with a deterministic algorithm, is difficult to predict^[1] and exhibits statistical behavior similar to a truly random sequence. PRBS generators are used in telecommunication, but also in encryption, simulation, correlation technique and time-of-flight spectroscopy.

Details[edit]

A binary sequence (BS) is a sequence${\displaystyle a_0,\dots ,a_{N-1}}$ of ${\displaystyle N}$ bits, i.e.

${\displaystyle a_j\in \{0,1\}}$ for ${\displaystyle j=0,1,...,N-1}$.

A BS consists of ${\displaystyle m=\sum a_j}$ ones and ${\displaystyle N-m}$ zeros.

A BS is a pseudorandom binary sequence (PRBS) if^[2] its autocorrelation function, given by

${\displaystyle C(v)=\sum _{j=0}^{N-1}{a}_j{a}_{j+v}}$

has only two values:

${\displaystyle C(v)=\{\begin{array}{l}m,\text{if}v\equiv 0(\text{mod}N)\\ mc,\text{otherwise}\end{array}}$

where

${\displaystyle c=\frac{m-1}{N-1}}$

is called the duty cycle of the PRBS, similar to the duty cycle of a continuous time signal. For a maximum length sequence, where ${\displaystyle N=2^k-1}$, the duty cycle is 1/2.

A PRBS is 'pseudorandom', because, although it is in fact deterministic, it seems to be random in a sense that the value of an ${\displaystyle a_j}$ element is independent of the values of any of the other elements, similar to real random sequences.

A PRBS can be stretched to infinity by repeating it after ${\displaystyle N}$ elements, but it will then be cyclical and thus non-random. In contrast, truly random sequence sources, such as sequences generated by radioactive decay or by white noise, are infinite (no pre-determined end or cycle-period). However, as a result of this predictability, PRBS signals can be used as reproducible patterns (for example, signals used in testing telecommunications signal paths).^[3]

Practical implementation[edit]

Pseudorandom binary sequences can be generated using linear-feedback shift registers.^[4]

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Some common^{[5][6][7][8][9]} sequence generating monic polynomials are

PRBS7 = ${\displaystyle x^7+x^6+1}$

PRBS9 = ${\displaystyle x^9+x^5+1}$

PRBS11 = ${\displaystyle x^{11}+x^9+1}$

PRBS15 = ${\displaystyle x^{15}+x^{14}+1}$

PRBS20 = ${\displaystyle x^{20}+x^3+1}$

PRBS23 = ${\displaystyle x^{23}+x^{18}+1}$

PRBS31 = ${\displaystyle x^{31}+x^{28}+1}$

An example of generating a 'PRBS-7' sequence can be expressed in C as

In this particular case, 'PRBS-7' has a repetition period of 127 bits.

Notation[edit]

The PRBSk or PRBS-k notation (such as 'PRBS7' or 'PRBS-7') gives an indication of the size of the sequence. ${\displaystyle N=2^k-1}$ is the maximum number^[3]:§3 of bits that be in the sequence. The k indicates the size of a unique word of data in the sequence. If you segment the N bits of data into every possible word of length k, you will be able to list every possible combination of 0s and 1s for a k-bit binary word, with the exception of the all-0s word.^[3]:§2 For example, PRBS3 = '1011100' could be generated from ${\displaystyle x^3+x^2+1}$.^[5] If you take every sequential group of three bit words in the PRBS3 sequence (wrapping around to the beginning for the last few three-bit words), you will find the following 7 word arrangements:

Paterno 2 7 11

Those 7 words are all of the ${\displaystyle 2^k-1=2^3-1=7}$ possible non-zero 3-bit binary words, not in numeric order. The same holds true for any PRBSk, not just PRBS3.^[3]:§2

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See also[edit]

Pattern 2.7.1 Software

References[edit]

1. ^'PRBS Pseudo Random Bit Sequence Generation'. TTi. Retrieved 21 January 2016.
2. ^Naszodi, Laszlo. 'Articles on Correlation and Calibration'. Archived from the original on 11 November 2013.
3. ^ ^abcd'ITU-T Recommendation O.150'. October 1992.
4. ^Paul H. Bardell, William H. McAnney, and Jacob Savir, 'Built-In Test for VLSI: Pseudorandom Techniques', John Wiley & Sons, New York, 1987.
5. ^ ^abTomlinson, Kurt (4 February 2015). 'PRBS (Pseudo-Random Binary Sequence)'. Bloopist. Retrieved 21 January 2016.
6. ^Koopman, Philip. 'Maximal Length LFSR Feedback Terms'. Retrieved 21 January 2016.
7. ^'What are the PRBS7, PRBS15, PRBS23, and PRBS31 polynomials used in the Altera Transceiver Toolkit?'. Altera. 14 February 2013. Retrieved 21 January 2016.
8. ^Riccardi, Daniele; Novellini, Paolo (10 January 2011). 'An Attribute-Programmable PRBS Generator and Checker (XAP884)'(PDF). Xilinx. Table 3:Configuration for PRBS Polynomials Most Used to Test Serial Lines. Retrieved 21 January 2016.
9. ^'O.150 : General requirements for instrumentation for performance measurements on digital transmission equipment'. 1997-01-06.

Pattern 2.7.1 Tool

External links[edit]

• OEISsequence A011686 (A binary m-sequence: expansion of reciprocal) -- the bit sequence for PRBS7 = ${\displaystyle x^7+x^6+1}$